Halide titanium(IV) Schiff base complexes; fluoride and bromide derivatives and evidence for a new seven-coordinate chloride intermediate

Coles, Simon J.; Hursthouse, Michael B.; Kelly, D. G.; Toner, Andrew J.; Walker, Nigel

doi:10.1039/a805764h

Cited by 62 publications

(36 citation statements)

References 18 publications

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“…The finding that metal complexes of these ligands are ubiquitous is a reflection of their facile synthesis, wide application and the accessibility of diverse structural modifications (Coles et al, 1998). We report here the synthesis and crystal structure of the title complex, a new copper(II) complex, with a tridentate Schiff base ligand derived from the condensation of 2-acetylpyridine and diamine.…”

Section: Sup-1mentioning

confidence: 99%

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Dichlorido{N-[1-(2-pyridyl)ethylidene]ethane-1,2-diamine}copper(II)

Wang

et al. 2009

Acta Cryst E

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Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.009 Å; R factor = 0.053; wR factor = 0.160; data-to-parameter ratio = 14.9.The title complex, [CuCl 2 (C 9 H 13 N 3 )], is mononuclear and contains a five-coordinate Cu II atom. The geometry of the Cu II atom can be described as tetragonal-pyramidal derived from the calculation of the value = 0.102. The three N atoms of the pyridine and ethane-1,2-diamine ligands and one Cl atom belong to the basal plane and the other Cl atom represents the axial position of the pyramid. The Cu atom is displaced by 0.2599 (2) Å from the basal plane towards the axial Cl atom. In the crystal, molecules are linked into chains by intermolecular N-HÁ Á ÁCl and C-HÁ Á ÁCl hydrogen bonds. Related literatureFor general background, see: Coles et al. (1998). For the calculation of the geometry parameter in five-coordinate complexes, see: Addison et al. (1984). ExperimentalCrystal data

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Section: Sup-1mentioning

confidence: 99%

“…For general background, see: Coles et al (1998). For the calculation of the geometry parameter in five-coordinate complexes, see: Addison et al (1984).…”

Section: Related Literaturementioning

confidence: 99%

Dichlorido{N-[1-(2-pyridyl)ethylidene]ethane-1,2-diamine}copper(II)

Wang

et al. 2009

Acta Cryst E

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“…In 1, the C(31)-H(31c) bond is directed towards the centre of the C (11)(12)(13)(14)(15)(16) ring of an adjacent molecule and these contacts link molecules in pairs about centres of symmetry; also, the C(71)-H(71b) bond points from the opposite side to one end of the Absolute structure parameter, x --0.004 (7) Largest diffraction peak and hole (e.Å -3 ) 0.24 and -0.22 0.28 and -0.22 C(11-16) ring and links molecules around a twofold-screw symmetry axis parallel to the b axis. In compound 2, C(31)-H(31a)ÁÁÁC (11)(12)(13)(14)(15)(16) contacts link molecules by translation along the a axis, and the methylene C(71)-H(71b) bond makes close contact with a neighbouring chelate ring and thus forms chains along a 2 1 symmetry axis parallel to the b axis. A comparison of 1 and 2 with our previously reported Cu(II) and Ni(II) complexes [24] indicates that the differences in bond distances, bond angles, and in the deviations of the metal ions from the mean square-planes between 1 and 2 arise not only from the presence of more bulky ethyl substituents in 2 compared to the less-steric methyl substituents in 1, but also from electronic effects of the Schiff base ligands and metal ion; the alignment and mode of bonding of the pseudohalogens, also play important roles.…”

Section: Thermal Analysismentioning

confidence: 99%

“…Transition metal complexes with oxygen and nitrogen donor Schiff bases are of particular interest [11,12] for their ability to possess unusual configurations, structural lability and their sensitivity to molecular environments [13]. Amongst them, the enduring popularity of tridentate Schiff bases stems from the ease with which they can be synthesized, their versatility and their wide-ranging complexing ability [14]. Symmetrical Schiff base ligands, usually obtained by the condensation of a symmetrical diamine with two molecules of aldehyde/ketone providing identical moieties on each side of the diamine, have symmetrical electronic and steric contributions in the complex.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, characterization and crystal structures of two square-planar Ni(II) complexes with unsymmetrical tridentate Schiff base ligands and monodentate pseudohalides

Shit

Sen

Mitra

et al. 2009

Transition Met Chem

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Two new square-planar Ni(II) complexes, [NiL 1 (NCS)] (1) and [NiL 2 (N 3 )] (2) have been synthesized with the unsymmetrical tridentate Schiff base ligands [(CH 3 ) 2 NCH 2 CH 2 N=C(CH 3 )CH=C(OH)(C 6 H 5 )], L 1 H, derived from benzoylacetone and 2-dimethylaminoethylamine and [(CH 3 CH 2 ) 2 NCH 2 CH 2 N=C(CH 3 )CH=C(OH)(C 6 H 5 )], L 2 H, derived from benzoylacetone and 2-diethylaminoethylamine, respectively. The complexes have been characterized by elemental analysis, FT-IR, UV-Vis spectroscopy, electrochemical and thermal methods (where applicable). Structures have been established by the single-crystal X-ray diffraction technique which reveals the discrete nature of the complexes in which the metal centers adopt a distorted square planar geometry. Coordination environments of the metal ions in the complexes are satisfied with two different unsymmetrical Schiff base ligands having similar N 2 O donor sets and a terminal pseudohalide anion (thiocyanate for 1 and azide for 2).

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“…This class of ligand is flexible in terms of both size and charge [2]. Schiff base ligands and their metal complexes are omnipresent because of their easy synthesis, wide applications and the convenience of diverse structural modifications [3]. Schiff bases have been reported to be potential anticancer drugs [4].…”

Section: Introductionmentioning

confidence: 99%